SAMPE Journal - September/October 2020 - 10
FEATURE / COMPOSITE BONDED JOINTS
DCB specimens. A comparison of the typical load-
displacement curves for each arrester configuration
is shown in Figure 7. Furthermore, the images of
fracture surfaces of all specimens are shown in
Figure 8. In the 02-902 specimens, the 0° layers of the
arrester finally failed, and almost no damage was
seen in the 90° layers (Figure 8a). Similarly, in the 03902 specimens, final failure occurred because of the
breakage of 0° layers (Figure 8b). When the number
of 0° layers increased from two plies to three plies,
failure occurred with a larger load than that in the
02-902 specimens. Unlike the other two specimens,
in the 02-901 specimens, the breakage of 90° layers
caused the final peeling of the bonded interface
theory using the load and displacement values
at the point where the arrested crack started to
propagate (i.e., the maximum load point). The
apparent mode-I fracture toughness was 1.47 kJ/
m2 in the specimens without the arrester. Its values
were 9.13, 11.5, and 5.96 kJ/m2 in the 02-902, 03-902,
and 02-901 specimens, respectively. Therefore, their
fracture toughness increased by 520%, 680%, and
300% respectively compared with the specimens
without the arrester. In the arrester configuration
in which the 0° layers failed, the number of 0°
layers determined the maximum load. Therefore,
it is a significant parameter to improve fracture
toughness. The energy absorption was 5.39 N∙m
(a) (b)
Figure 6. Comparison of crack tip locations at 30 mm displacement: (a) specimens without arrester and (b) specimens with
arrester (02-902 specimen).
Figure 7. Comparison of typical load-displacement curves
of DCB specimens with various arrester configurations.
(Figure 8c). Consequently, although the failure
load of the 02-901 specimens was lower than that
of the other two specimens, the final displacement
increased significantly because the carbon fibers
of the 90° layers failed progressively and absorbed
the energy. Figures 9 and 10 depict, respectively,
the apparent mode-I fracture toughness and
energy absorption of each specimen. The error
bars represent the standard deviation. The fracture
toughness was calculated from the corrected beam
10
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SAMPE JOURNAL
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in the specimens without the arrester. Its values
were 10.0, 12.7, and 15.6 N∙m in the 02-902, 03-902,
and 02-901 specimens, respectively. Therefore, their
energy absorption increased by 86%, 140%, and
190% compared with the specimens without the
arrester. Although the 03-902 specimens showed the
best apparent mode-I fracture toughness, the 02901 specimens showed the best energy absorption
characteristics because the carbon fibers of the 90°
layers absorbed the energy by progressive failure.
S E P T E M B E R /O C TO B E R 2 0 2 0
w w w. s a m p e . o r g
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SAMPE Journal - September/October 2020
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SAMPE Journal - September/October 2020 - Table of contents
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